--source include/galera_cluster.inc
--source include/have_innodb.inc

CREATE TABLE parent (
    id INT NOT NULL,
    PRIMARY KEY (id)
) ENGINE=InnoDB;

CREATE TABLE child (
    id INT, 
    parent_id INT,
    FOREIGN KEY (parent_id) 
        REFERENCES parent(id)
	ON UPDATE SET NULL
	ON DELETE SET NULL
) ENGINE=InnoDB;

INSERT INTO parent VALUES (1),(2);
INSERT INTO child VALUES (1,1),(2,2);

--connection node_2
DELETE FROM parent WHERE id = 1;
SELECT parent_id IS NULL FROM child WHERE id = 1;

--connection node_1
SELECT parent_id IS NULL FROM child WHERE id = 1;

UPDATE parent SET id = 3 WHERE id = 2;
SELECT parent_id IS NULL FROM child WHERE id = 2;

--connection node_2
SELECT parent_id IS NULL FROM child WHERE id = 2;

--connection node_1
DROP TABLE child;
DROP TABLE parent;